Emerson Fisher L2e User manual

www.Fisher.com

Fisher™L2e Electric Level Controller

Contents

Introduction 1.................................

Scope of Manual 1.............................

Description 2.................................

Specifications 2...............................

Educational Services 2.........................

Installation 4..................................

Attaching a Vertical Displacer 5..................

Attaching a Horizontal Displacer 5...............

Attaching the Sensor to the Vessel 5.............

Electrical Connections 6........................

Seal Certification 10........................

L2e Initial Setup (Dry Displacer) 11...............

L2e Zero and Span Adjustment (Wet Displacer) 11..

Principle of Operation 12........................

Maintenance 14................................

Removing the Controller From the Sensor 14......

Installing Sensor Repair Kit (RL2SENSX012) 14.....

Replacing the Complete Controller

Assembly (RL2E0X00C22) 15.................

Related Documents 16..........................

Parts Ordering 16...............................

Figure 1. Fisher L2e Electric Level Controller

X0660

Introduction

Scope of Manual

This instruction manual includes installation, adjustment, maintenance, and parts ordering information for the Fisher

L2e electric liquid level controller.

Do not install, operate or maintain an L2e electric liquid level controller without being fully trained and

qualified in valve, actuator, and accessory installation, operation, and maintenance. To avoid personal

injury or property damage, it is important to carefully read, understand and follow all the contents of

this manual, including all safety cautions and warnings. If you have any questions about these

instructions, contact your Emerson sales office before proceeding.

Instruction Manual

D103531X012

L2e Controller

June 2022

Instruction Manual

D103531X012

L2e Controller

June 2022

Description

The L2e electric liquid level differential gap on-off controller uses a displacement type sensor to detect liquid level or

the interface between two liquids of different specific gravities.

The L2e controls the lower trip point (zero) that closes the dump valve, allowing the vessel to fill to the upper trip

point. Once the upper trip point is reached, the dump valve opens to drain the fluid down to the zero or lower trip

point. The difference between the upper trip point and the zero or lower trip point is called differential gap or DG. The

L2e operates as a two position (on-off) controller.

The instrument uses an electronic switch (solid state relay) that provides one Normally Closed (NC) and one Normally

Open (NO) contact. The electronic switch can be used to provide liquid monitoring or to provide differential gap (DG)

control by operating an electrically-actuated valve.

Unless otherwise noted, all NACE references are to NACE MR01752002.

Specifications

Specifications for the controller and sensor are listed in table 1.

Educational Services

Emerson Automation Solutions

Educational Services - Registration

Phone: +1-800-338-8158

E-mail: [email protected]

emerson.com/mytraining

Instruction Manual

D103531X012

L2e Controller

June 2022

Table 1. Specifications

Available Configurations

Controller: Differential gap (DG) electric control

action with intuitive Zero and Span Adjustments

(refer to page 2 for differential gap description)

Sensor: Displacertype liquid level sensor for

mounting to side of vessel

Input Signal

Type: Liquid level or liquidtoliquid interface

Level Change Required for Full Change in State of

Output: 5.0 to 305 mm (0.2 to 12 inches)

Dynamic differential gap for the level in the vessel

depends on factors such as valve sizing, actuator

speed, molecular weight, pressure, and temperature

of process fluids, input flow rate, and vessel size.

Specific Gravity Limits

Minimum SG: 0.15

Maximum SG

PVC Displacer: 1.3

SST Displacer: 1.1

Switch Contact Electrical Rating

1 amp resistive, 0.5 amp inductive/28 VDC; contacts

are not polarity sensitive

Note: The easy-Drive™actuator application draws

7 mA through the L2e contacts @ 5 VDC

Power Requirements

Voltage: 9 - 30 VDC

Maximum Input Voltage Ripple: 400 mV

Current draw:

Less than 15 mA steady state

Less than 500 mA peak startup or switching transient

Sensor to Vessel Connection

J2 NPT threaded or JNPS 2 CL150 through 1500

slipon flange connection(1)

Controller Connection

Electrical 1/2-14 NPT external conduit connection

with 0.5 m (greater than 18 inches) of 18 AWG lead

wires, located at the bottom of the case

Displacer Sizes

J48 X 305 mm, 541 cm3(17/8 X 12 inches, 33 in3)

J76 X 152 mm, 688 cm3(3 X 6 inches, 42 in3)

Maximum Displacer Insertion Length(2), Horizontal

or Vertical

1-7/8 x 12 Displacer with one 6-inch extension

(optional use)

3 x 6 Displacer with one 3-inch extension

(optional use)

Displacer Material and Maximum Mechanical

Sensor Working Pressure(3)

PVC Displacer: Consistent with CL1500 pressure

temperature ratings per ASME B16.34 up to

maximum pressure of 258.5 bar (3750 psig).

For PED (97/23/EC) maximum pressure limited to

200 bar (2900 psig).

S31603 SST Displacer: CL600 pressure temperature

ratings per ASME B16.34 up to maximum pressure of

99.3 bar (1440 psig)

Note: For slipon flange connection, maximum sensor

working pressure must be consistent with the flange

ratings

Operative Ambient Temperature Limits(3)

Controller: 40 to 85°C (40 to 185°F)

Operative Process Temperature Limits(3)

Sensor:

JPVC Displacer: -18 to 71°C (0 to 160°F)

JS31603 SST Displacer: 40 to 204°C (40 to 400°F)

Construction Materials

Controller

Case and Cover: Marine grade aluminum

Switch: Aluminum 6061T

Switch Body Internal O-ring:Fluorosilicone Rubber

Span Levers: Stainless steel

Springs: Stainless steel

Sensor

Sensor Body: LCC

ORings: Fluorocarbon

Pivot Assembly: Stainless steel

Displacer: JPolyvinylchloride (PVC) or JS31603 SST

Sensor Spring: Stainless steel

-continued-

Instruction Manual

D103531X012

L2e Controller

June 2022

Table 1. Specifications (continued)

Hazardous Area Classifications Available

Switch Only

Refer to to GH04148 instruction manual

(D104234X012) for switch information

cCSAus

Explosion-proof Class I Division 1, Groups ABCD

Dust Ignition-proof Class II Division 1 2, Groups EFG

Single Seal(4)

ATEX II 2 GD

Flameproof Ex d IIC T5 (Ta ≤ @85°C) /

T6 (Ta≤ @ 78°C)

Dust Ex tb IIIC T92°C / T85°C Db IP6X

1 A Max

IECEx

Flameproof Ex d IIC T5 (Ta ≤ @85°C) /

T6 (Ta≤ @ 78°C)

Dust Ex tb IIIC T92°C / T85°C Db IP6X

1 A Max

Ingress Protection Rating per IEC 60529: IP66

Refer to D104234X012 for Special Conditions of Safe

Use

Canadian Registration (CRN)

Refer to the L2 CRN which is deemed applicable to

the L2e.

Declaration of SEP

Fisher Controls International LLC declares this

product to be in compliance with Article 4 paragraph

3 of the PED Directive 2014/68/EU. It was designed

and manufactured in accordance with Sound

Engineering Practice (SEP) and cannot bear the CE

marking related to PED compliance.

However, the product may bear the CE marking to

indicate compliance with other applicable European

Community Directives.

NOTE: Specialized instrument terms are defined in ANSI/ISA Standard 51.1  Process Instrument Terminology.

1. Converting from a threaded NPT connection to a flange connection is to be done by the end-user. Refer to Converting a Threaded NPT Connection to a Flange Connection instruction Manual

Supplement (D103277X012), available at Fisher.com or from your Emerson sales office.

2. Maximum span setting with 1 7/8 x 12 inch horizontal displacer plus 6 inch extension is not recommended due to potentially insufficient zero adjustment.

3. The pressure and temperature limits in this document and any applicable code limitations should not be exceeded.

4. Electronic switch pressure rating is based on maximum pressure at sensor. Controller housing vent is designed to drop maximum process pressure to less than 6.9 bar (100 psig) at switch.

Installation

WARNING

Always wear protective clothing, gloves, and eyewear when performing any installation operations to avoid personal

injury.

To avoid personal injury or property damage caused by the sudden release of process fluid, be certain the service

conditions do not exceed the sensor pressure limits. Use pressurelimiting or pressurerelieving devices to prevent service

conditions from exceeding these limits.

Check with your process or safety engineer for any additional measures that must be taken to protect against process

media.

If installing this into an existing application, also refer to the WARNING at the beginning of the Maintenance section of this

instruction manual.

NOTICE

If the L2e electric level controller is installed on a vessel that is to be shipped to a different location (e.g. skid mounted

units), remove the displacer and displacer rod extensions before shipment. Failure to do so could result in damage to the

instrument and or the displacer rod due to vibration and impact loading during shipment. After the vessel is installed at its

final location, reassemble the displacer and displacer rod extension.

Instruction Manual

D103531X012

L2e Controller

June 2022

1. Be sure there are no obstructions inside the vessel that will interfere with displacer installation or operation.

2. Provide the appropriate connection in the vessel wall to match the sensor connection. Locate the vessel wall

connection such that the displacer will be at the desired control level.

Attaching a Vertical Displacer

Refer to figure 12 for part locations.

1. Thread jam nut (key 63) all the way onto the threaded portion of the universal joint assembly (key 69).

2. Thread the displacer (key 81) all the way onto the threaded portion of the universal joint assembly.

3. Tighten the jam nut against the displacer.

Attaching a Horizontal Displacer

Refer to figure 12 for part locations.

1. Thread the displacer (key 81) all the way onto the displacer rod (key 64) or extension (key 82) and tighten.

Attaching the Sensor to the Vessel

Insert the displacer end of the L2e sensor into the vessel connection and tighten enough to seal the threads. If

necessary, loosen or tighten slightly to obtain the horizontal orientation shown in figure 2. Make sure that the

controller case is level.

NOTICE

The displacer rod (key 64) is not a handle. Grasp sensor body or controller housing to lift and carry to avoid internal

component damage.

Figure 2. Sensor Orientation

CORRECT CONTROLLER MOUNTING

HOLE ORIENTATION WHEN MOUNTED ON VESSEL

A6639

Instruction Manual

D103531X012

L2e Controller

June 2022

Electrical Connections

WARNING

For explosionproof applications, disconnect power before installing, servicing or removing electrical components.

Personal injury or property damage from fire or explosion may result if power is not disconnected.

Select junction boxes, wiring and/or cable glands that are rated for the environment of use (such as hazardous location,

ingress protection, and temperature). Failure to use properly rated electrical hardware wiring and/or cable glands can

result in personal injury or property damage from fire or explosion. Wiring connections must be in accordance with local,

regional, and national codes for any given hazardous area approval. Failure to follow the local, regional, and national codes

could result in personal injury or property damage from fire or explosion.

An electrical 1/2-14 NPT conduit connection with 0.5 meters (greater than 18 inches) of 18 AWG lead wires is located

at the bottom of the case. The conduit connection is integral to the body of the switch.

The Electronic Switch has Normally Closed (NC) and Normally Open (NO) outputs. The Switch electronics is housed in

Explosion/Flame proof and dust explosion proof enclosure.

The action of the controller is such that the switch contacts activate a dump valve when the fluid level exceeds the

high trip point, and remain in that state until the level falls below the low trip point. At the low trip point the switch

contacts de-activate or close the dump valve. The contacts remain in that state until the level builds up to the high trip

point again.

Connect L2e electrical wires as shown in table 2. To reverse the action refer to table 2 and reverse wiring for normally

open and normally closed.

Table 2. L2e Electrical Wire Color Code

Wire Color Description

White/Red DC Supply +

White/Black DC Supply -

Red Normally Closed Contact

Brown Common Contact

Blue Normally Open Contact

Green Ground (Housing, Safety)

Instruction Manual

D103531X012

L2e Controller

June 2022

Wiring Configurations

There are two recommended wiring configurations depending on the preferred site solution and approach to electric

level control; a direct connection to the easy-Drive actuator, shown in figure 3 or a direct connection to the easy-Drive

actuator and a remote monitor (figure 4 and 5). In these examples, the L2e is wired using a common and separate N/O

or N/C contact. When implemented as suggested, these wiring configurations provide definitive level switch points

and help reduce issues associated with single pole single throw contact switches, such as “bouncing” due to vibration

or sloshing liquids in a vessel.

Note

The wiring diagrams shown are for “sourcing”-type digital input cards.

“Sinking”-type digital input cards should not be wired to the L2e switch terminals in parallel with the easy-Drive input terminals as

they will be unintentionally and constantly activated by the easy-Drive “sourcing”-type input circuits.

If a PLC with sinking digital input cards is used, the easy-Drive input terminals need to be driven by a digital output card on that PLC

and the PLC must control those digital outputs by its logic program after reading its digital inputs. This will introduce additional

delay into the response to the input, modifying the dynamic differential gap achieved by the controller.

OPEN

Figure 3. Local Level Control with Direct Connection to easy-Drive Actuator without Remote Monitor

BROWN

BLUE

RED

12/24 VDC

POWER SUPPLY

easy-Drive ACTUATOR

POWER AND CONTROL TERMINAL

X0661

GREEN (GND)

1 CONNECT GREEN WIRE TO ACTUATOR GROUND (NOT SHOWN)

2 OPEN CONTACT (2) MAY BE LABELED N.O. AND CLOSE CONTACT (3) MAY BE LABLED N.C.

W9795-4

REMOVE COVER TO

ACCESS POWER AND

CONTROL TERMINAL

easy-Drive ACTUATOR WITH

FISHER D3 CONTROL VALVE

WHITE/RED

WHITE/BLACK

Instruction Manual

D103531X012

L2e Controller

June 2022

BROWN

RED

BLUE

WHITE/RED

BLUE

BROWN

DISCRETE INPUT CONFIGURED FOR DRY CONTACT CLOSURE EXTERNALLY POWERED

12/24 VDC

POWER SUPPLY

easy-Drive ACTUATOR

POWER AND CONTROL TERMINAL

ROC809 DI MODULE

X0661

OPEN

1 CONNECT GREEN WIRE TO ACTUATOR GROUND (NOT SHOWN)

2 OPEN CONTACT (2) MAY BE LABELED N.O. AND CLOSE CONTACT (3) MAY BE LABLED N.C.

GREEN (GND)

REMOVE COVER TO

ACCESS POWER AND

CONTROL TERMINAL

W9795-4

easy-Drive ACTUATOR WITH

FISHER D3 CONTROL VALVE

Figure 4. Local Level Loop Control with Direct Connect to easy-Drive Actuator

with ROC809 Remote Monitor

WHITE/BLACK

RED

Instruction Manual

D103531X012

L2e Controller

June 2022

Figure 5. Local Level Loop Control with Direct Connect to easy-Drive Actuator

with FloBoss 107 Remote Monitor

W9795-4

BROWN

RED

BLUE

RED

BLUE

BROWN

DISCRETE INPUT CONFIGURED FOR DRY CONTACT CLOSURE EXTERNALLY POWERED

12/24 VDC

POWER SUPPLY

FloBoss 107 AI/DI MODULE OR

FloBoss 107 DIs ON CPU

MODULE'S OPTIONAL I/O ASSEMBLY

X0661

OPEN

1 CONNECT GREEN WIRE TO ACTUATOR GROUND (NOT SHOWN)

2 OPEN CONTACT (2) MAY BE LABELED N.O. AND CLOSE CONTACT (3) MAY BE LABLED N.C.

GREEN (GND)

REMOVE COVER TO

ACCESS POWER AND

CONTROL TERMINAL

easy-Drive ACTUATOR

POWER AND CONTROL TERMINAL

easy-Drive ACTUATOR WITH

FISHER D3 CONTROL VALVE

WHITE/BLACK

WHITE/RED

Instruction Manual

D103531X012

L2e Controller

June 2022

Seal Certification

The L2e instrument is not dual-seal certified. However, the enclosure is not exposed to process pressure during normal

operation, and is vented, as shown in 6. The process seal is contained in the separate mechanical sensor which can be

separated from the L2e enclosure without disturbing the process connection. A process seal failure will result in

process fluids being exhausted through the L2e enclosure vent, with an accompanying decrease in enclosure pressure

from the operating process pressure. Thus annunciation of a process seal failure is provided. The switch component,

which is separately sealed from the L2e main enclosure volume by a metal cap, is never exposed to full process

pressure even in the event of process seal failure.

Figure 6. Schematic

PROCESS PRESSURE

VESSEL

INSTRUMENT ENCLOSURE

VENT

PROCESS

MEDIA SEAL

Controller housing vent is designed to drop

maximum process pressure to less than 6.9 bar

(100 psig) at switch in event of primary seal failure

DETAIL

SENSOR

Certified Single Seal Device

Maximum seal pressure: 6.9 bar (100 psig)

Seal Temperature: 40 to 204°C (40 to 400°F)

SWITCH

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